There's no way this is going to be a comprehensive list because I went through a 5 year stint of watching obscure 80's horror films and drinking heavily but I'll do my best with the ones that stand out the most:

Braindead or Dead Alive (1992)Dawn of the Dead (1978)Day of the Dead (1985)Zombie Flesh Eaters or Zombi (1979)City of the Living Dead (1980)The Beyond (1981)House by the Cemetery (1981) Cannibal Holocaust (1980)Cannibal Ferox (1981)Return of the Living Dead 3 (1993)The Thing (1982)The Fly (1986)The Blob (1986)The Burning (1981) The Intruder (1989)Fist of the North Star (1986)Jason Goes to Hell: The Final Friday (1993)Jason X (2001)Men Behind The Sun (1988)Hellraiser (1987)Hellbound: Hellraiser 2 (1988)

I've left out more modern movies like the Saw and Hostel series and slasher remakes because the gore in those films just all blurs into one forgettable exercise in pointlessness to me (although I do think the first Saw is a legitimately good movie).

Hm, I guess that would be Dead Alive (Braindead), Story of Rikki (next to some other weird Japanese masterpieces), Meet the Feebles (yes, I count that puppet movie, too), Cannibal! The Musical and maybe some older trash horror movies like "Redneck Zombies".